Q9) 3. A student finds that the mass of 25 mL of an unknown liquid is 20.5 g. What is the density of this substance?

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .